Concrete anchor



June 3,1930. c. G. PREIS 1,761,800

CONCRETE ANCHOR Filed March 28, 1928 Patented June 3, 1930 nane. PEEIS, 0F LYNBBOQK, NEW roan conens'rn ANCHOR Application filedMaroh 2a, 1928. Serial No. 265,300.

I invention relates general to metal faste ing devices for concrete work and has pnrt cularrefcrence. to a so-called concrete anchororinsert designed for securing to concrete floors, walls,.:ceilingsor other cement shafting, machinery and the like.

Thefmain object ofmy invention is the provision of 1 a; concrete anchor or insure which is of: simple; construction, inexpensive toimake and. which is of such configuration that itobtains-a maximum amount of supstructures, such articles as hangers, beams,

- portfromithe surrounding concrete and is se- .form a ball and socket connection with large curely held therein against displacement and can withstand greatstrains.

Another. object of the invention is the provision of a concrete anchoror insert having a bell-shaped or spherical upperchamber and an outwardly flaring lower chamber-which co-operate with a removable rocker nut to bearing surface, assuring even distribution oiload' with less danger of breaking of anchor housing, permitting maximum radial and axial adjustability of the supporting bolt and locating the point of greatest strain as far from the entrance part of the insert as pos 'sible, wherethe anchor housing because of its shape and the supportit receives from Numerous otherobjects and'advantages of i the invention will be apparent as it is bet-- ter understoodifrom the followingdescrip- '7 tion,lwhich, taken 'in connection with the 7 ferered embodimentthereof.

along chenil e of Fig. 1. i 45; i

g "partlybroken awayto show -Fig. r2,isa fastening lugs.

accompanying drawings, discloses a prestruction moreclearly.

F 1g; 3 is a cross-sectional plan view talren :Referring now more in detail to the drawings, and especiallyto Fig. 1 thereof, the pre- QTIEBITGd embodiment of my invention comprises aconjcrete anchor "housing of castlron ,or other suitable'metal having'a top wall 11,

Whichin the present instance is flat, terminatthe surrounding concrete is the strongest.

partialgview of the temporary icient headroorn between the ing into an annular projecting flange 12-,an annular side wall l3, which is rounded or spherical in part and extends downwardly and then inwardly to form an inward shoulder or constricted throat part 14, and then flares outwardlyat 15 in-a substantial straight line, terminating into a lateral annular flange l6. Said aninilar flange lGhasa-t two opposite points bifurcated projections'which form notches 17 which are to receive a fastening screw or nail to temporarily fasten the anchor housing to a mold, frame'or scafi'oldinguntil the concrete or cement material has been poured around the anchorhousijng and'has set and dried. It will be iO ed thatthe inward shoulder or throat part 14- divides; the i anchor housing into, two.- parts, namely, into. an uppe n inn r be l shaped r p e i a chamber 1 8, and a lower andouter outwardly fiaring'partf 19. V i

Th lding r nch n t 20 ich m y "be inse ted or lf movedafft l he an r h ns ing has been permanently embedded into the concrete, is elongated, with a straight top, straight sides and bottom, and curved or rocker-shaped ends 21. which engage and correspond with the curved or spherical inner surface of-the wall part 13,'so saidwallpart13- and the constricted throat 14, aballarid-socket or universal'joint connection witha maximum amount of bearing surface. The nut 20 has; central threaded perforation .22 to receive of tQ: supporting bolt 23 whoseopposite end terminates in a screw 11111324; ,As illustrated indotted-line position, thejsupporting bolt may be wung r tilted a iallyin' direction from; the position of natural rest shownin full l nes- Thi radial r diu tahility or h ngeef Po t on 1f the supporting olt is madecpossible by the universal joint, con;- nection between the rocker nut 20-and the curved inner wall of the bell-shapedchamber,

. and-the extent ofadjiustability-is limitedonly by the angle of theQutwardfiareofthe wall of the :lowerchamber of the anchor housing;- a The supportingbolt 23 is also. (adjustable-v longitudinally, that is, to say, there issufiitop of the holda ing nut 20 and the toy-pyea-ll- 11 as to formwith Grate l aising the: threaded end jeo "annular linesof reinforcement forsaidhous' i inggfanda supporting means removablysej curedin said upper chamber and radially to permit the bolt to be screwed into the holding nut 20 so that the screw-threaded end of the boltwill project a more or less distance beyond the straight top of the holding nut 20. This will permit a tightening or loosening of the bolt to accommodate variations in thedimen'sion of thearticle support ed by the bolt 23; In order to stop the rocker nut 20 from turning when the bolt '23 is screwedhome, integral lugs 25 are provided at opposed pointsof the inner'wall of the bell-shaped chamber. 7 preciated by thoseskilledin the artthat it is the novel exterior and interior construe-f tion and configuration of the anchorlhfous mg and the novel construction and co-operating shape-of the r Ocker nut-QOwhich make" this concrete anchor or insert superior to anysimilar deiriceoi which I am now aware; j The-point ofgreatest strain in my im proved constructionis located far from the opening into the housing at theconstricted throat part 14,? which forms an outer conv cavity which is filled outandgreatly' rein forced by the surrounding concrete. An

other such concavity or hollow is iormedbetween the projecting flange 12 and the depending wall filled out withconcrete which helps to sup-' It will be readily appart 13, and this hollow'also is 3. In a concrete anchor, in combination, an

anchor housing having a rounded upper chamber, a constricted throat ais'ubstantial distance from the housing entrance" and a lower chamber With outwardly fiaring Wall, V a rocker shaped anchor nut removably posi- Y tioned in said rounded upper chamber and I supported by said throat, and a forming with said chamber a ball-' and 'soclret'jointand a 5 supporting part threadedly engaged with said nut and radially i'tiltable in all direclugs to limit rotation off-said anchor-nut.

4. Ina concrete anchor, in combination; an a e I e i V. r I V v V iv chamber a constrlcted throat part asubstananchor housing having a vrounded upper 'tionsi said p r chamber ,havingintegral I I tial distance from the housing; entrance and I a'lower'chamberwithoutwardly flaringwall, a rocker shaped anchor nutremovably fp'ost' tioned in said roundedjupperchamber and 'supportedby 'said'throat'a'nd' forming with f said chamber arball and socket joint and-a supporting jpart 'threadedly engaged with said nut and rad1ally-t1ltable-inal-ldlrections, said lower chamber havmg :means for securing said anchor housing in prop r iti until 1t is fully set in. the con r t port the upper part of the housing'and great- 1y assists'in-securing the same against displacement.

z'lhis borrowing of the strength i v ofthe concrete at the most strategical point is peculiar, to my invention, and permits the use of much lighter castings withattendant economythan has heretofore been thought possible; and thefemployment of-even'drawn sheet metal anchor housings.

@W'hat I claim as" new and desiretosecure by Letters Patent of the'United States,is':

" 1. In a concreteanchorin combination an anchorhousing having a rounded upper' chamber, a constricted throa't a substantial distance from the housing entrance "andga lower chamberw'vith outwardlyflaringfwall; a rockcr shapedanchornut remoirably' positioned in said 7 rounded upper chamber and 7 supported by said throat and iorming with said chamber aball and socket' joint, and a I supp orting anchor housingfhavinga" rounded" upper bolt'fthreadedly engaged withv said nut and radi-allyjtiltable in alldirec'tions. V 2; In a concr'ete anchor, incombination, an-

chamber, a constrictedthroat part and a r lower chamber with outwardly flaring,'wall, 7'

saidanchor housing being also provided with" I I a top flange and a bottomffiange, said con stricted throat partlandsaid flanges forma 5*: 2

ing-Ywith adjacent housingipar'ts a corre--- if spon'd'mg number of concavities' which, whenembedded in' aconcrete structure,'tprovidef u i I tiltableinall directions;

cAnL c. ram s; 1- v Y 5' I 2100] V 

